CVE-2026-8932 — incomplete mTLS config matching in conn reuse

Description (CNA)

libcurl would reuse a previously created connection even when some mTLS config related option had been changed that should have prohibited reuse. libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. However, some TLS settings related to client certificates were left out from the configuration match checks, making them match too easily. In particular options related to the private key.

Affected (CNA)

Vendor / product	Versions
curl / curl	affected 7.7.0 before 8.14.2; affected 8.15.0 before 8.16.1; affected 8.17.0 before 8.20.1
curl / curl	affected a1d6ad26100bc493c7b04f1301b1634b7f5aa8b4 before 7541ae569d82fb308a5e2d94916027da4fa3ba3e
curl / curl	affected 8.20.0; affected 8.19.0; affected 8.18.0; affected 8.17.0; affected 8.16.0; affected 8.15.0; affected 8.14.1; affected 8.14.0; affected 8.13.0; affected 8.12.1; affected 8.12.0; affected 8.11.1; affected 8.11.0; affected 8.10.1; affected 8.10.0; affected 8.9.1; affected 8.9.0; affected 8.8.0; affected 8.7.1; affected 8.7.0; affected 8.6.0; affected 8.5.0; affected 8.4.0; affected 8.3.0; affected 8.2.1; affected 8.2.0; affected 8.1.2; affected 8.1.1; affected 8.1.0; affected 8.0.1; affected 8.0.0; affected 7.88.1; affected 7.88.0; affected 7.87.0; affected 7.86.0; affected 7.85.0; affected 7.84.0; affected 7.83.1; affected 7.83.0; affected 7.82.0; affected 7.81.0; affected 7.80.0; affected 7.79.1; affected 7.79.0; affected 7.78.0; affected 7.77.0; affected 7.76.1; affected 7.76.0; affected 7.75.0; affected 7.74.0; affected 7.73.0; affected 7.72.0; affected 7.71.1; affected 7.71.0; affected 7.70.0; affected 7.69.1; affected 7.69.0; affected 7.68.0; affected 7.67.0; affected 7.66.0; affected 7.65.3; affected 7.65.2; affected 7.65.1; affected 7.65.0; affected 7.64.1; affected 7.64.0; affected 7.63.0; affected 7.62.0; affected 7.61.1; affected 7.61.0; affected 7.60.0; affected 7.59.0; affected 7.58.0; affected 7.57.0; affected 7.56.1; affected 7.56.0; affected 7.55.1; affected 7.55.0; affected 7.54.1; affected 7.54.0; affected 7.53.1; affected 7.53.0; affected 7.52.1; affected 7.52.0; affected 7.51.0; affected 7.50.3; affected 7.50.2; affected 7.50.1; affected 7.50.0; affected 7.49.1; affected 7.49.0; affected 7.48.0; affected 7.47.1; affected 7.47.0; affected 7.46.0; affected 7.45.0; affected 7.44.0; affected 7.43.0; affected 7.42.1; affected 7.42.0; affected 7.41.0; affected 7.40.0; affected 7.39.0; affected 7.38.0; affected 7.37.1; affected 7.37.0; affected 7.36.0; affected 7.35.0; affected 7.34.0; affected 7.33.0; affected 7.32.0; affected 7.31.0; affected 7.30.0; affected 7.29.0; affected 7.28.1; affected 7.28.0; affected 7.27.0; affected 7.26.0; affected 7.25.0; affected 7.24.0; affected 7.23.1; affected 7.23.0; affected 7.22.0; affected 7.21.7; affected 7.21.6; affected 7.21.5; affected 7.21.4; affected 7.21.3; affected 7.21.2; affected 7.21.1; affected 7.21.0; affected 7.20.1; affected 7.20.0; affected 7.19.7; affected 7.19.6; affected 7.19.5; affected 7.19.4; affected 7.19.3; affected 7.19.2; affected 7.19.1; affected 7.19.0; affected 7.18.2; affected 7.18.1; affected 7.18.0; affected 7.17.1; affected 7.17.0; affected 7.16.4; affected 7.16.3; affected 7.16.2; affected 7.16.1; affected 7.16.0; affected 7.15.5; affected 7.15.4; affected 7.15.3; affected 7.15.2; affected 7.15.1; affected 7.15.0; affected 7.14.1; affected 7.14.0; affected 7.13.2; affected 7.13.1; affected 7.13.0; affected 7.12.3; affected 7.12.2; affected 7.12.1; affected 7.12.0; affected 7.11.2; affected 7.11.1; affected 7.11.0; affected 7.10.8; affected 7.10.7; affected 7.10.6; affected 7.10.5; affected 7.10.4; affected 7.10.3; affected 7.10.2; affected 7.10.1; affected 7.10; affected 7.9.8; affected 7.9.7; affected 7.9.6; affected 7.9.5; affected 7.9.4; affected 7.9.3; affected 7.9.2; affected 7.9.1; affected 7.9; affected 7.8.1; affected 7.8; affected 7.7.3; affected 7.7.2; affected 7.7.1; affected 7.7

CWE

CWE-305

References

ADP enrichment

CISA-ADP

No English description supplied.

https://hackerone.com/reports/3733910